K 2500 Yukon 4WD V8-6.0L VIN U (2000)
Powertrain Control Module: Description and Operation
PCM Service Precautions
The PCM is designed to withstand normal current draws associated with vehicle operations. Avoid overloading any circuit. When testing for opens or
shorts, do not ground any of the PCM circuits unless instructed. When testing for opens or shorts, do not apply voltage to any of the PCM circuits unless
instructed. Only test these circuits with a DMM while the PCM connectors remain connected.